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spi: initial BF54x SPI support
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Initial BF54x SPI support

 - support BF54x SPI0
 - clean up some code (whitespace etc)
 - will support multiports in the future
 - start using portmux calls

Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Bryan Wu authored and Linus Torvalds committed Dec 5, 2007
1 parent c24b260 commit 131b17d
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Showing 2 changed files with 86 additions and 70 deletions.
139 changes: 69 additions & 70 deletions drivers/spi/spi_bfin5xx.c
View file
Original file line number Diff line number Diff line change
@@ -1,17 +1,20 @@
/*
* File: drivers/spi/bfin5xx_spi.c
* Based on: N/A
* Author: Luke Yang (Analog Devices Inc.)
* File: drivers/spi/bfin5xx_spi.c
* Maintainer:
* Bryan Wu <bryan.wu@analog.com>
* Original Author:
* Luke Yang (Analog Devices Inc.)
*
* Created: March. 10th 2006
* Description: SPI controller driver for Blackfin 5xx
* Bugs: Enter bugs at http://blackfin.uclinux.org/
* Created: March. 10th 2006
* Description: SPI controller driver for Blackfin BF5xx
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* Modified:
* March 10, 2006 bfin5xx_spi.c Created. (Luke Yang)
* August 7, 2006 added full duplex mode (Axel Weiss & Luke Yang)
* July 17, 2007 add support for BF54x SPI0 controller (Bryan Wu)
*
* Copyright 2004-2006 Analog Devices Inc.
* Copyright 2004-2007 Analog Devices Inc.
*
* This program is free software ; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
Expand All @@ -31,27 +34,27 @@

#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/spi/spi.h>
#include <linux/workqueue.h>
#include <linux/delay.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/delay.h>
#include <asm/dma.h>

#include <asm/portmux.h>
#include <asm/bfin5xx_spi.h>

MODULE_AUTHOR("Luke Yang");
MODULE_DESCRIPTION("Blackfin 5xx SPI Contoller");
MODULE_AUTHOR("Bryan Wu, Luke Yang");
MODULE_DESCRIPTION("Blackfin BF5xx SPI Contoller Driver");
MODULE_LICENSE("GPL");

#define DRV_NAME "bfin-spi-master"
#define IS_DMA_ALIGNED(x) (((u32)(x)&0x07)==0)

#define DEFINE_SPI_REG(reg, off) \
Expand Down Expand Up @@ -124,6 +127,7 @@ struct chip_data {
u16 flag;

u8 chip_select_num;
u8 chip_select_requested;
u8 n_bytes;
u8 width; /* 0 or 1 */
u8 enable_dma;
Expand Down Expand Up @@ -188,53 +192,37 @@ static void restore_state(struct driver_data *drv_data)
bfin_spi_disable(drv_data);
dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n");

#if defined(CONFIG_BF534) || defined(CONFIG_BF536) || defined(CONFIG_BF537)
dev_dbg(&drv_data->pdev->dev,
"chip select number is %d\n", chip->chip_select_num);

switch (chip->chip_select_num) {
case 1:
bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3c00);
SSYNC();
break;
if (!chip->chip_select_requested) {

case 2:
case 3:
bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PJSE_SPI);
SSYNC();
bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3800);
SSYNC();
break;

case 4:
bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PFS4E_SPI);
SSYNC();
bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3840);
SSYNC();
break;

case 5:
bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PFS5E_SPI);
SSYNC();
bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3820);
SSYNC();
break;
dev_dbg(&drv_data->pdev->dev,
"chip select number is %d\n", chip->chip_select_num);

case 6:
bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PFS6E_SPI);
SSYNC();
bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3810);
SSYNC();
break;
switch (chip->chip_select_num) {
case 1:
peripheral_request(P_SPI0_SSEL1, DRV_NAME);
break;
case 2:
peripheral_request(P_SPI0_SSEL2, DRV_NAME);
break;
case 3:
peripheral_request(P_SPI0_SSEL3, DRV_NAME);
break;
case 4:
peripheral_request(P_SPI0_SSEL4, DRV_NAME);
break;
case 5:
peripheral_request(P_SPI0_SSEL5, DRV_NAME);
break;
case 6:
peripheral_request(P_SPI0_SSEL6, DRV_NAME);
break;
case 7:
peripheral_request(P_SPI0_SSEL7, DRV_NAME);
break;
}

case 7:
bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PJCE_SPI);
SSYNC();
bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3800);
SSYNC();
break;
chip->chip_select_requested = 1;
}
#endif

/* Load the registers */
write_CTRL(chip->ctl_reg);
Expand Down Expand Up @@ -277,7 +265,7 @@ static void null_reader(struct driver_data *drv_data)

static void u8_writer(struct driver_data *drv_data)
{
dev_dbg(&drv_data->pdev->dev,
dev_dbg(&drv_data->pdev->dev,
"cr8-s is 0x%x\n", read_STAT());
while (drv_data->tx < drv_data->tx_end) {
write_TDBR(*(u8 *) (drv_data->tx));
Expand Down Expand Up @@ -316,7 +304,7 @@ static void u8_cs_chg_writer(struct driver_data *drv_data)

static void u8_reader(struct driver_data *drv_data)
{
dev_dbg(&drv_data->pdev->dev,
dev_dbg(&drv_data->pdev->dev,
"cr-8 is 0x%x\n", read_STAT());

/* clear TDBR buffer before read(else it will be shifted out) */
Expand Down Expand Up @@ -403,7 +391,7 @@ static void u8_cs_chg_duplex(struct driver_data *drv_data)

static void u16_writer(struct driver_data *drv_data)
{
dev_dbg(&drv_data->pdev->dev,
dev_dbg(&drv_data->pdev->dev,
"cr16 is 0x%x\n", read_STAT());

while (drv_data->tx < drv_data->tx_end) {
Expand Down Expand Up @@ -700,9 +688,9 @@ static void pump_transfers(unsigned long data)
drv_data->write = drv_data->tx ? chip->write : null_writer;
drv_data->read = drv_data->rx ? chip->read : null_reader;
drv_data->duplex = chip->duplex ? chip->duplex : null_writer;
dev_dbg(&drv_data->pdev->dev,
"transfer: drv_data->write is %p, chip->write is %p, null_wr is %p\n",
drv_data->write, chip->write, null_writer);
dev_dbg(&drv_data->pdev->dev, "transfer: ",
"drv_data->write is %p, chip->write is %p, null_wr is %p\n",
drv_data->write, chip->write, null_writer);

/* speed and width has been set on per message */
message->state = RUNNING_STATE;
Expand Down Expand Up @@ -816,7 +804,7 @@ static void pump_transfers(unsigned long data)
/* full duplex mode */
BUG_ON((drv_data->tx_end - drv_data->tx) !=
(drv_data->rx_end - drv_data->rx));
cr = (read_CTRL() & (~BIT_CTL_TIMOD));
cr = (read_CTRL() & (~BIT_CTL_TIMOD));
cr |= CFG_SPI_WRITE | (width << 8) |
(CFG_SPI_ENABLE << 14);
dev_dbg(&drv_data->pdev->dev,
Expand All @@ -834,7 +822,7 @@ static void pump_transfers(unsigned long data)
cr = (read_CTRL() & (~BIT_CTL_TIMOD));
cr |= CFG_SPI_WRITE | (width << 8) |
(CFG_SPI_ENABLE << 14);
dev_dbg(&drv_data->pdev->dev,
dev_dbg(&drv_data->pdev->dev,
"IO write: cr is 0x%x\n", cr);

write_CTRL(cr);
Expand All @@ -849,7 +837,7 @@ static void pump_transfers(unsigned long data)
cr = (read_CTRL() & (~BIT_CTL_TIMOD));
cr |= CFG_SPI_READ | (width << 8) |
(CFG_SPI_ENABLE << 14);
dev_dbg(&drv_data->pdev->dev,
dev_dbg(&drv_data->pdev->dev,
"IO read: cr is 0x%x\n", cr);

write_CTRL(cr);
Expand All @@ -861,7 +849,7 @@ static void pump_transfers(unsigned long data)
}

if (!tranf_success) {
dev_dbg(&drv_data->pdev->dev,
dev_dbg(&drv_data->pdev->dev,
"IO write error!\n");
message->state = ERROR_STATE;
} else {
Expand All @@ -881,9 +869,11 @@ static void pump_transfers(unsigned long data)
/* pop a msg from queue and kick off real transfer */
static void pump_messages(struct work_struct *work)
{
struct driver_data *drv_data = container_of(work, struct driver_data, pump_messages);
struct driver_data *drv_data;
unsigned long flags;

drv_data = container_of(work, struct driver_data, pump_messages);

/* Lock queue and check for queue work */
spin_lock_irqsave(&drv_data->lock, flags);
if (list_empty(&drv_data->queue) || drv_data->run == QUEUE_STOPPED) {
Expand Down Expand Up @@ -916,8 +906,8 @@ static void pump_messages(struct work_struct *work)
"got a message to pump, state is set to: baud %d, flag 0x%x, ctl 0x%x\n",
drv_data->cur_chip->baud, drv_data->cur_chip->flag,
drv_data->cur_chip->ctl_reg);
dev_dbg(&drv_data->pdev->dev,

dev_dbg(&drv_data->pdev->dev,
"the first transfer len is %d\n",
drv_data->cur_transfer->len);

Expand Down Expand Up @@ -1193,6 +1183,15 @@ static int __init bfin5xx_spi_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "can not alloc spi_master\n");
return -ENOMEM;
}

if (peripheral_request(P_SPI0_SCK, DRV_NAME) ||
peripheral_request(P_SPI0_MISO, DRV_NAME) ||
peripheral_request(P_SPI0_MOSI, DRV_NAME)) {

dev_err(&pdev->dev, ": Requesting Peripherals failed\n");
goto out_error_queue_alloc;
}

drv_data = spi_master_get_devdata(master);
drv_data->master = master;
drv_data->master_info = platform_info;
Expand Down
17 changes: 17 additions & 0 deletions include/asm-blackfin/mach-bf548/defBF54x_base.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1644,8 +1644,25 @@
#define RESTART 0x20 /* Work Unit Transitions */
#define DI_SEL 0x40 /* Data Interrupt Timing Select */
#define DI_EN 0x80 /* Data Interrupt Enable */

#define NDSIZE 0xf00 /* Flex Descriptor Size */
#define NDSIZE_0 0x0000 /* Next Descriptor Size = 0 (Stop/Autobuffer) */
#define NDSIZE_1 0x0100 /* Next Descriptor Size = 1 */
#define NDSIZE_2 0x0200 /* Next Descriptor Size = 2 */
#define NDSIZE_3 0x0300 /* Next Descriptor Size = 3 */
#define NDSIZE_4 0x0400 /* Next Descriptor Size = 4 */
#define NDSIZE_5 0x0500 /* Next Descriptor Size = 5 */
#define NDSIZE_6 0x0600 /* Next Descriptor Size = 6 */
#define NDSIZE_7 0x0700 /* Next Descriptor Size = 7 */
#define NDSIZE_8 0x0800 /* Next Descriptor Size = 8 */
#define NDSIZE_9 0x0900 /* Next Descriptor Size = 9 */

#define DMAFLOW 0xf000 /* Next Operation */
#define DMAFLOW_STOP 0x0000 /* Stop Mode */
#define DMAFLOW_AUTO 0x1000 /* Autobuffer Mode */
#define DMAFLOW_ARRAY 0x4000 /* Descriptor Array Mode */
#define DMAFLOW_SMALL 0x6000 /* Small Model Descriptor List Mode */
#define DMAFLOW_LARGE 0x7000 /* Large Model Descriptor List Mode */

/* Bit masks for DMAx_IRQ_STATUS, MDMA_Sx_IRQ_STATUS, MDMA_Dx_IRQ_STATUS */

Expand Down

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